Motion-picture projector.



R. F. PAGE.

MOTION PICTURE PROJECTOR.

APPLICATION HLED SEPT. 15. 1914.

1,159,791, Patented Nov. 9, 1915.

UNITED STATES PATENT OFFICE.

BOSCOE 1. PAGE, OF EVERETT, WASHINGTON, ASSIGNOR OF ONE-HALF TO LOUIS M.

MATSON, OF SNOHOMISH COUNTY, WASHINGTON.

MOTION-PICTURE PROJECTOR.

To all whom it may concern:

Be it known that I, Rosco'n F. lPAcE, a citizen of the United States, and res dent of Everett, in the count of Snohom1sh and State of Washington, ave invented certain new and useful Improvements 1n Motron- Picture Projectors, of which the following is a full, true, and exact specification.

This invention relates to motion picture projectors, and more particularly to mechanism for imparting intermittent rotatlon of the drive shaft to the driven shaft, Wherein no overthrow of the driven shaft can occur.

In transmitting intermittent movement to the driven shaft of a picture machine 1t 1s obvious that any kicking forward of the driven shaft will cause oscillation, noise and an indistinct projection of the picture through the film which is carried by the driven shaft. I accomplish a noiseless and certain intermittent movement of the driven shaft, without any overthrow thereof, by my device, which Will be more fully herelnafter described and explained, illustrated 1n the accompanying drawings and pointed out in the appended claim.

In the drawings, Figure 1 is a side elevation of my device shown attached to the drive shaft of a moving picture machlne. Fig. 2 is a view of the same showing the edge of the driving wheel.

Referring now more particularly to the drawings, reference numeral 1 designates a drive shaft; 2', a wheel secured rigidly thereto; 3, the driven shaft, to which is simllarly secured a wheel 4:, having studs 5 around its peripheral face which fit into a cam track 6 in the wheel 2. Bearings for shafts 1 and 3 respectively are indicated at 7 and 8 respectively. The peripheral face of the wheel 2 is concave, as plainly shown in the drawings,

and the corresponding face of the wheel 4:

fits into the concave face of the wheel 2, and the studs 5 upon the wheel 4 fit into the said cam track. The cam track, it will be noted,

' follows the edge of the wheel 2 in parallelism for a portion of its length, but a worm-like portion occurs in the cam track, as plainly seen in Fig. 2.

The operation of the device as follows: When the parts are in the positions as seen in Fig. 2, and the wheel 2 is caused to rotate by turning the drive shaft 1, no movement will be transmitted to the wheel 4 be- Speciflcation of Letters Patent.

have provided means for Patented NOV. 9, 1915.

Application filed September 15, 1914. Serial No. 861,745.

cause the stud 5, which is in engagement with the cam track, simply wipes around therein, but a further rotation of the wheel 2 brings the worm-like portion of the cam track into engagement with the said stud and the stud, of course, follows the worm-v like portion and thus causes the wheel 4 to turn until the stud 5, which is immediately to the left (as viewed in Fig. 2) of the stud just mentioned, toenter'the cam track. A still further rotation of the wheel 2 will finally cause the stud which was at first in engagement with the cam track to pass entirely out of the same, and as it does so the next stud enters the cam track. A continued rotation of the drive shaft 1 will, obviously, allow'the wheel 4 to remain stationary until the stud which is in engagement with the cam track passes out of it and allows the next stud to enter as before, and so on. In this instance, as above indicated, the shafts 1 and 3 are the shafts of a moving picture pro ector which may be of any approved type, and no particular description of the same is thought to be here necessary for a full understanding of myinventlon. Upon the driven shaft 3 are shown the usual studs 9 which enter the perforations which occur along at regular intervals at either side of the film roll, all in the usual manner.

From the foregoing it will be seen that I intermittently causing the film roll of a moving picture machine to be advanced, as is required in the moving-picture art, and that no overthrow or undue advancement of the film can occur because of the fact that one of the studs 5 is at all times in engagement with the cam track; that is to say, as one stud passes out of the worm-like portion another stud must enter the said portion.

It will further be seen that my device is comparatively noiseless in its action, which is a decided advantage, and that it is certain in its operation, that it is simple and cheap of manufacture, and not likely to get out of order.

While I have shown and described a particular form and use of my invention, I am aware that many changes therein will readily suggest themselves to others skilled in the art without departing from the spirit and scope .of the invention and I do not therefore desire to be limited to the exact form shown and described except as defined by the appended claim. In accounting machines, cash registers, and the like, for example, wherein it is necessary that a numeral wheel be intermittently rotated and wherein no overthrow must occur, my device as fully shown and described can be applied with equal efficiency as when applied to a moving-picture projector.

Having described my invention, what I claim as new and desire to protect by Letters Patent is- In a mechanism for transmitting intermittent movement from a drive shaft to a driven shaft and for preventing overthrow of the driven shaft, the combination of a cylindrical wheel having parallel ends .secured to the drive shaft, the said wheel having a uniformly concave peripheral face, a cylindrical wheel upon the driven shaft which is at right angles to the first mentioned wheel and whose face fits the concave face of the first mentioned wheel, a cam track in the first mentioned wheel which parallels the edge of that wheel for-afip ortion of its length and has a helical portion wheel upon the driven shaft is allowed to remain stationary during a portion of the rotary movement of the other wheel, is advanced a distance of one stud spacefor each revolution of the wheel upon the driven shaft, and is then intermittently rotated without overthrow or back lash.

ROSCOE F. PAGE.

Witnesses:

FRED P. GORIN, EMMA KRoeaaR. 

